Trichocolletes chrysostomus is a species of bee in the family Colletidae and the subfamily Colletinae. It is endemic to Australia. It was described in 1929 by British-American entomologist Theodore Dru Alison Cockerell.
Description Male body length is 12 mm, female 13 mm. The eyes are not hairy. Colouration is mainly black, with cream and red markings and yellow hair.
Distribution and habitat The species occurs in coastal Western Australia and southern South Australia. The type locality is Eradu.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Dillwynia uncinata, Daviesia incrassata, Daviesia brevifolia, Jacksonia cupulifera and Bossiaea species.
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